Well your question is a bit tricky.
10G ethernet isn't going anywhere anytime soon.
That said, 10GBaseT, the 10Ge spec that currently uses copper is a bit cumbersome. The cable is limited by distance and, in my opinion, a complete nightmare to terminate yourself. I put 10G backbones in our main office which isn't too large, but I chose fiber because, overall I've found it to be easier to deal with, length is essentially a non-issue, and with the fiber we ran, we could easily upgrade to 40G by changing our switches.
Not to mention, there's a lot more options for SFP+ devices than 10GBaseT

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